# ASA Physical Status Classification

ASA-PS

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/asa_physical_status`
HTML: https://magentlab.com/docs/asa-physical-status
Markdown: https://magentlab.com/docs/asa-physical-status.md

Not a medical device. Not a diagnosis, dose, or listing recommendation.

## What it computes

Return the caller-assigned ASA Physical Status class 1-6 with optional emergency suffix E and the published class definition (ASA 2014, last amended 2020).

## When to use

When an agent already has an ASA Physical Status class 1-6 and whether the case is an emergency, and needs the canonical label (e.g. 1 or 2E) and published definition. magent does not examine the patient or assign the class. Not Gupta MICA and not Mallampati.

## When not to use

- Not a medical device. Classification alone does not predict perioperative risk (ASA statement).
- The caller assigns ASA class 1-6 and the emergency flag. magent does not examine the patient. Examples in the ASA table (for example BMI) are not extra scored items.
- Not an anesthetic plan. Not Gupta 2011 MICA (ASA 1-5 only). Not Mallampati.

## Formula

```
Caller-assigned ASA Physical Status class 1-6; append E when emergency is true (ASA House of Delegates 2014, last amended 2020)
```

## Citation

[ASA Physical Status Classification System](https://www.asahq.org/standards-and-guidelines/asa-physical-status-classification-system)
American Society of Anesthesiologists; Committee of Oversight: Economics
Approved by the ASA House of Delegates on October 15, 2014, and last amended on December 13, 2020
DOI: none

## Worked example

### ASA 1 not emergency

Given: `asa_class=1, emergency=false`

1. asa_class 1, emergency false → asa_label 1; a normal healthy patient


### ASA 2E emergency

Given: `asa_class=2, emergency=true`

1. asa_class 2, emergency true → asa_label 2E; mild systemic disease with E suffix


## Also searched as

- ASA physical status
- ASA-PS
- ASA class
- ASA classification
- ASA 1-6
- ASA emergency E
- physical status classification
- ASA 2020

## Parameters

- `asa_class` (integer, required): ASA Physical Status class 1-6 as assigned by the caller (1 a normal healthy patient; 2 mild systemic disease; 3 severe systemic disease; 4 severe systemic disease that is a constant threat to life; 5 moribund, not expected to survive without the operation; 6 declared brain-dead organ donor). Not Gupta 2011 MICA (ASA 1-5). magent does not examine the patient.
- `emergency` (boolean, required): true appends E for emergency surgery: delay in treatment of the patient would lead to a significant increase in the threat to life or body part (ASA 2014/2020). Required. Class 6 may still take E. magent does not examine the patient.

## Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

Method: `POST /api/calc/asa_physical_status`
Max items: 25
Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic)
Status: PREVIEW

- 1 to 25 items. Each item uses the same keys as the GET query parameters.
- POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
- The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
- HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
- Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
- x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request:

```json
{
  "items": [
    {
      "asa_class": "1",
      "emergency": "false"
    },
    {
      "asa_class": "1",
      "emergency": "false"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/asa-physical-status

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/asa_physical_status",
  "items": [
    {
      "description": "A normal healthy patient",
      "emergency": false,
      "components": [
        {
          "value": 1,
          "factor": "asa_class",
          "met": true
        },
        {
          "factor": "emergency",
          "met": false
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "American Society of Anesthesiologists; Committee of Oversight: Economics",
        "id": "asa-2020",
        "source": "Approved by the ASA House of Delegates on October 15, 2014, and last amended on December 13, 2020",
        "title": "ASA Physical Status Classification System"
      },
      "formula": "asa_physical_status",
      "formula_expression": "Caller-assigned ASA Physical Status class 1-6; append E when emergency is true (ASA House of Delegates 2014, last amended 2020)",
      "asa_class": 1,
      "asa_label": "1"
    },
    {
      "description": "A normal healthy patient",
      "emergency": false,
      "components": [
        {
          "value": 1,
          "factor": "asa_class",
          "met": true
        },
        {
          "factor": "emergency",
          "met": false
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "American Society of Anesthesiologists; Committee of Oversight: Economics",
        "id": "asa-2020",
        "source": "Approved by the ASA House of Delegates on October 15, 2014, and last amended on December 13, 2020",
        "title": "ASA Physical Status Classification System"
      },
      "formula": "asa_physical_status",
      "formula_expression": "Caller-assigned ASA Physical Status class 1-6; append E when emergency is true (ASA House of Delegates 2014, last amended 2020)",
      "asa_class": 1,
      "asa_label": "1"
    }
  ]
}
```

## Response fields

- `formula` (string): asa_physical_status
- `formula_expression` (string): Published ASA Physical Status class-plus-E rule
- `asa_class` (integer): Caller-assigned class 1-6
- `emergency` (boolean): true when the caller assigns the emergency suffix E
- `asa_label` (string): Class as a string; E is appended when emergency is true (e.g. 1 or 2E)
- `description` (string): ASA 2014/2020 definition for that class
- `components` (array): asa_class and emergency criterion rows
- `citation` (object): ASA Physical Status 2014/2020
- `disclaimer` (string): Not a medical device

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "description": "A normal healthy patient",
  "emergency": false,
  "components": [
    {
      "value": 1,
      "factor": "asa_class",
      "met": true
    },
    {
      "factor": "emergency",
      "met": false
    }
  ],
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "American Society of Anesthesiologists; Committee of Oversight: Economics",
    "id": "asa-2020",
    "source": "Approved by the ASA House of Delegates on October 15, 2014, and last amended on December 13, 2020",
    "title": "ASA Physical Status Classification System"
  },
  "formula": "asa_physical_status",
  "formula_expression": "Caller-assigned ASA Physical Status class 1-6; append E when emergency is true (ASA House of Delegates 2014, last amended 2020)",
  "asa_class": 1,
  "asa_label": "1"
}
```

## Errors

- HTTP 400 `invalid_asa_physical_status`: asa_class must be an integer from 1 to 6 (ASA Physical Status 2014/2020). Do not use Gupta 2011 invalid_asa_class (1-5). Returned before settlement; you are not charged.
- HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.

Shared HTTP 402 and 503: https://magentlab.com/docs/payments

## Related tools

- [Mallampati](https://magentlab.com/docs/mallampati) — Return the Samsoon 1987 modified Mallampati class 1-4 from a caller-assigned integer, with a stable label.
- [RCRI](https://magentlab.com/docs/rcri) — Sum the six Lee 1999 revised cardiac risk index factors and return class I–IV.
- [Gupta MICA](https://magentlab.com/docs/gupta-mica) — Compute the Gupta 2011 Table 2 logistic probability of 30-day myocardial infarction or cardiac arrest after surgery from age, ASA class, functional status, creatinine category, and surgery type.
- [Aldrete](https://magentlab.com/docs/aldrete) — Compute the Aldrete 1970 postanesthetic recovery score as the sum of five caller-assigned 0-2 signs (activity, respiration, circulation, consciousness, color) and return the 1970 recovery-room band.

## Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s.

- GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall).
- HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote.
- Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional.
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402.

- offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront.
- offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization.

- not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search.

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers).

Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments

Stdio MCP (one process per host): https://magentlab.com/docs/mcp

## Guarantees

- HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
- exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
- HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
- Execution is timeout-bounded and concurrency-capped.
- Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.